Forging method and forging apparatus

ABSTRACT

The present disclosure relates to a forging method and forging apparatus in which at front and rear portions of a workpiece, two products can be simultaneously shaped, thereby to improve a productivity of compression-shaping. The forging apparatus includes a press having upper and lower dies; a tray plate supply assembly configured to supply, by one pitch, a tray plate from one side of the press to an opposite side of the press along a middle portion between front and rear portions of a top of the lower die such that the tray plate can ascend and descend each time the upper die is raised; a punching unit disposed on the upper and lower dies at one side thereof to continuously form a workpiece fixing hole in the tray plate; a workpiece plate supply assembly disposed in front of an opposite side of the punching unit for feeding the workpiece plate by one pitch to a position below the workpiece fixing hole defined in the tray plate, wherein the workpiece plate supply assembly forms a through-protrusion to pass through the workpiece fixing hole on a front-rear directional middle portion in a portion of the workpiece plate corresponding to the fed one pitch; a cutting and pressing and fixing assembly provided on the upper and lower die at an opposite side of the punching unit for cutting the workpiece plate to be fed to the position below the workpiece fixing hole of the tray plate by one pitch and for pressing and fixing the through-protrusion formed on the middle portion of the cut workpiece into the workpiece fixing hole; and a pressing and shaping unit disposed on the upper and lower dies at an opposite side of the cutting and pressing and fixing assembly for compressing and shaping the fed workpiece.

TECHNICAL FIELD

The present disclosure relates to a forging method and forging apparatus. More particularly, the present disclosure relates to a forging method and forging apparatus in which at front and rear portions of a workpiece, two products can be simultaneously shaped, thereby to improve a productivity of compression-shaping.

BACKGROUND ART

Generally, forging is a shaping method that presses a workpiece such as iron or non-ferrous metal to cause plastic deformation thereof. The forging work for compressing the workpiece is performed by a press machine (hereinafter referred to as a “press”) including an upper die and a lower die.

Further, conventionally, when a workpiece is subjected to plastic deformation via forging, the forging may be classified into a single forging method and a sequential forging method. In the single forging method, a forged product is obtained by compressing a single workpiece once. Further, in the sequential forging method, a long plate workpiece is injected to a progressive press to form a forged product via multiple sequential forgings.

In this connection, an example of the conventional sequential forging method is disclosed in Korean Patent No. 10-1513723, which was previously filed by the present applicant and tiled as a forging method and forging apparatus for different workpieces (hereinafter referred to as a conventional forging method and conventional forging apparatus).

The conventional forging method includes preparing a press comprising upper and lower dies, each of which has a punching part, a cutting/pressing part, a pressing part, and an extraction part that are sequentially provided from one side to an opposite side thereof, and repeatedly elevating the upper die; continuously forming workpiece passing/fixing parts in a tray plate through the punching part by supplying a tray plate by one pitch from one side to an opposite side towards an upper side of the lower die whenever the upper die is lifted; introducing workpiece plates from a front side to upper sides of the workpiece passing/fixing parts whenever the upper die is lifted, repeatedly cutting the workpiece plates through the cutting/pressing part, continuously introducing the cut workpieces to upper sides of the workpiece passing/fixing parts, pressing the introduced workpiece, and fixing the workpieces to the workpiece passing/fixing parts; pressing the workpieces that are moved while being fixed to the tray plate, through the pressing part; and separating the workpieces that have been formed while being fixed to the tray plate, and extracting the separated workpieces to a lower side.

The convention forging apparatus includes a press having upper and lower dies; a tray plate supply assembly that supplies a tray plate by one pitch from one side to an opposite side towards an upper side of the lower die; punching parts that are provided on sides of the upper and lower dies to continuously form workpiece passing/fixing parts in the tray plate; a workpiece plate supply assembly that is provided in front of the press to supply a workpiece plate to the upper sides of the workpiece passing/fixing parts by one pitch; cutting/pressing parts that are provided in the upper and lower dies at opposite sides of the punching parts to repeatedly cut the workpiece plate introduced to upper sides of the workpiece passing/fixing parts and fix the cut workpieces to the workpiece passing/fixing parts after pressing the workpieces; pressing parts that are provided in the upper and lower dies at opposite sides of the cutting/pressing parts to press the moved workpieces; and extraction parts that are provided in the upper and lower dies at opposite sides of the pressing parts to separate and extract the formed workpieces.

However, in the conventional forging method and forging apparatus constructed as described above, the workpiece passing/fixing parts are drilled in the tray plate and then the workpiece is inserted and fixed in the workpiece passing/fixing parts. In this case, a front-rear width of the tray plate should be wider than a front-rear width of the workpiece. As a result, when the workpiece is shaped, an amount of the tray plate discarded after use is large, resulting in a problem that a manufacturing cost of a final product is increased.

PRIOR ART LITERATURE Patent Document

Patent Document 1: Korean Patent No. 10-1513723 (Apr. 14, 2014) titled as “Forging method and forging apparatus for different workpieces”.

DETAILED DESCRIPTION OF THE INVENTION Techinical Problem

The present disclosure is intended to overcome the above conventional problem.

Thus, a purpose of the present disclosure is to provide a forging method and forging apparatus in which at front and rear portions of a workpiece, two products can be simultaneously shaped, thereby to improve a productivity of compression-shaping, in which only a middle portion of a workpiece is fixed to a tray plate that fixes the workpiece to reduce a front-rear direction width of the tray plate and thus to reduce an amount of the tray plate used during the workpiece shaping, and in which a compression shaping of the workpiece is performed while a minimum size workpiece required for a final product is fixed on the tray plate such that an amount of the workpiece as used can be minimized.

Further, another purpose of the present disclosure is to provide a forging method and forging apparatus in which while only the middle portion of the workpiece is fixed to the tray plate, the workpiece is shaped at the front and rear portions thereof, and, thus, a chip or burr generated by drilling the workpiece fixing hole in the tray plate does not affect the shaped rear and front portions of the workpiece at all. Therefore, in the compression-shaping of the workpiece, this may prevent the shaping failure due to the influence of chips or burrs generated during the boring of the tray plate, thereby to achieve an advantage of minimizing a defective shaping rate.

Further, still another purpose of the present disclosure is to provide a forging method and forging apparatus in which the workpieces are fixed to the tray plate such that the workpieces are arranged to be spaced apart from each other in a left-right direction. Thus, although the workpiece is expanded in the lateral direction during the compression-shaping of each workpiece, the expansion may not impose any interference to neighboring workpieces. As a result, working accuracy can be improved during the compression-shaping of each workpiece, thereby shaping a high-precision product.

Technical Solution

In one aspect, the present disclosure provides a forging method comprising: an operation of ascending and descending an upper die of a press repeatedly, wherein the press includes the upper and lower dies sequentially having a punching unit, a cutting and pressing and fixing assembly, and a pressing and shaping unit from one side of the press to an opposite side of the press; a workpiece fixing hole shaping operation in which each time the upper die is raised, a tray plate is supplied by one pitch along a middle portion between front and rear portions of a top of the lower die from one side of the press to an opposite side of the press in such a manner that the tray plate can ascend and descend, and at the same time, a workpiece fixing hole is continuously punctured in the tray plate via the punching unit; a workpiece plate supply operation in which each time the upper die is raised, a workpiece plate is supplied from a front by one pitch to a position below the workpiece fixing hole of the tray plate located on the cutting and pressing and fixing assembly, and, at the same time, a through-protrusion to pass through the workpiece fixing hole is formed on a front-rear directional middle portion in a portion of the workpiece plate corresponding to the supplied one pitch; a workpiece fixing operation in which the workpiece plate supplied into the position below the workpiece fixing hole located on the cutting and pressing and fixing assembly is cut by one pitch, and, then, the through-protrusion formed on the middle portion of the cut workpiece passes through the workpiece fixing hole and is compressed and fixed into the workpiece fixing hole; and a workpiece shaping operation in which the workpiece moved while being fixed to the tray plate is compression-shaped by the pressing and shaping unit.

Further, in the forging method, in the workpiece shaping operation, in the workpiece shaping operation, the workpiece is shaped at front and rear portion of the workpiece via one or more workpiece shaping units, and then, the front and rear portions of the workpiece shaped via the one or more workpiece shaping units are compression-cut to complete a last product.

In another aspect, the present disclosure provides a forging apparatus comprising: a press having upper and lower dies; a tray plate supply assembly configured to supply, by one pitch, a tray plate from one side of the press to an opposite side of the press along a middle portion between front and rear portions of a top of the lower die such that the tray plate can ascend and descend each time the upper die is raised; a punching unit disposed on the upper and lower dies at one side thereof to continuously form a workpiece fixing hole in the tray plate; a workpiece plate supply assembly disposed in front of an opposite side of the punching unit for feeding the workpiece plate by one pitch to a position below the workpiece fixing hole defined in the tray plate, wherein the workpiece plate supply assembly forms a through-protrusion to pass through the workpiece fixing hole on a front-rear directional middle portion in a portion of the workpiece plate corresponding to the fed one pitch;

a cutting and pressing and fixing assembly provided on the upper and lower die at an opposite side of the punching unit for cutting the workpiece plate to be fed to the position below the workpiece fixing hole of the tray plate by one pitch and for pressing and fixing the through-protrusion formed on the middle portion of the cut workpiece into the workpiece fixing hole; and a pressing and shaping unit disposed on the upper and lower dies at an opposite side of the cutting and pressing and fixing assembly for compressing and shaping the fed workpiece.

Moreover, in the forging apparatus, the tray plate supply assembly includes an ascending and descending guide configured for supplying the tray plate away from the top face of the lower die and allowing the tray plate to move up and down.

Moreover, in the forging apparatus, the ascending and descending guide includes a plurality of ascending and descending guide rods, wherein the plurality of ascending and descending guide rods are formed in a middle portion of a top of the lower die and are arranged at intervals in a right-left direction, wherein the plurality of ascending and descending guide rods are maintained in an ascended position via an underlying spring while ascending and descending, wherein the plurality of ascending and descending guide rods are in close contact with a bottom face of the tray plate.

Moreover, in the forging apparatus, the workpiece fixing hole includes a plurality of fixing holes, wherein the through-protrusion includes a plurality of through fixing pins, wherein the plurality of through fixing pins penetrates the fixing holes constituting the workpiece fixing hole and then a top of the plurality of through fixing pins is compressed and extended by the cutting and pressing and fixing assembly.

Moreover, in the forging apparatus, the workpiece plate supply assembly includes: a workpiece plate supply unit disposed in front of the press having the cutting and pressing and fixing assembly for supplying the workpiece plate by one pitch; and protrusion forging means disposed between the workpiece plate supply unit and the cutting and pressing and fixing assembly for shaping the through-protrusion.

Moreover, in the forging apparatus, the protrusion forging means includes a fixed lower die and an ascending and descending upper die, wherein the fixed lower die has, at a top of the fixed die, a protrusion-shaping convex portion; wherein the ascending and descending upper die is disposed above the fixed lower die and has a protrusion-shaping concave portion at a bottom thereof, wherein the ascending and descending upper die repeatedly shapes the through-protrusions in a repetitive compression manner via iterative ascending and descending.

Moreover, in the forging apparatus, the cutting and pressing and fixing assembly includes: a workpiece cutting unit provided with a workpiece cutter at a lower front of the upper die to cut the workpiece plate via a lowering of the upper die; and a workpiece pressing and fixing unit provided at a rear end of the workpiece cutting unit, wherein the workpiece pressing and fixing unit 52 has a compressing pin at a bottom of the upper die, wherein the workpiece pressing and fixing unit pushes the through-protrusion formed on the middle portion of the workpiece into the workpiece fixing hole and compresses and fixes a top of the through-protrusion into the workpiece fixing hole via the lowering of the upper die.

Moreover, in the forging apparatus, the cutting and pressing and fixing assembly further includes a guide plate, wherein the guide plate has a rear end fixed to the lower die, wherein the guide plate protrudes forwards to be spaced from the top face of the lower die, wherein the guide plate has a guide groove defined in a lower portion of the plate, into which the tray plate is inserted to move to the opposite side, wherein the guide plate has a through hole defined above the groove, through which the compressing pin penetrates.

Moreover, in the forging apparatus, the cutting and pressing and fixing assembly further includes a plurality of ascending and descending guide rods, wherein the plurality of ascending and descending guide rods are disposed in a top portion of the lower die and are arranged in a front-rear direction, wherein the plurality of ascending and descending guide rods are maintained at an elevated position via an underlying spring while ascending and descending, wherein the plurality of ascending and descending guide rods are in close contact with a bottom face of the workpiece plate supplied from a front.

Moreover, in the forging apparatus, the pressing and shaping unit includes: at least one workpiece shaping unit provided on the upper and lower dies for shaping the workpiece via compression; and a last shaping unit provided on the upper and lower dies for compress-cutting, via a vertical cutter, the front and rear portions of the workpiece as shaped via the one or more workpiece shaping units, thereby obtaining a final product.

Moreover, in the forging apparatus, the tray plate includes a upward-bent reinforcement plate formed in a length-direction at front and rear ends of the tray plate for reinforcing the tray plate.

Moreover, in the forging apparatus, the workpiece is made of metal,

wherein the tray plate is made of a metal having a lower ductility than the workpiece.

Moreover, in the forging apparatus, the workpiece is made of aluminum or copper, wherein the tray plate is made of iron or stainless steel.

Advantageous Effects of the Invention

In accordance with the present disclosure, at front and rear portions of a workpiece, two products can be simultaneously shaped, thereby to improve a productivity of compression-shaping. Further, only a middle portion of a workpiece is fixed to a tray plate that fixes the workpiece to reduce a front-rear direction width of the tray plate and thus to reduce an amount of the tray plate used during the workpiece shaping. Further, a compression shaping of the workpiece is performed while a minimum size workpiece required for a final product is fixed on the tray plate such that an amount of the workpiece as used can be minimized.

Further, in accordance with the present disclosure, while only the middle portion of the workpiece is fixed to the tray plate, the workpiece is shaped at the front and rear portions thereof, and, thus, a chip or burr generated by drilling the workpiece fixing hole in the tray plate does not affect the shaped rear and front portions of the workpiece at all. Therefore, in the compression-shaping of the workpiece, this may prevent the shaping failure due to the influence of chips or burrs generated during the boring of the tray plate, thereby to achieve an advantage of minimizing a defective shaping rate.

Furthermore, in accordance with the present disclosure, the workpieces are fixed to the tray plate such that the workpieces are arranged to be spaced apart from each other in a left-right direction. Thus, although the workpiece is expanded in the lateral direction during the compression-shaping of each workpiece, the expansion may not impose any interference to neighboring workpieces. As a result, working accuracy can be improved during the compression-shaping of each workpiece, thereby shaping a high-precision product.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view showing a forging apparatus according to the present disclosure.

FIG. 2 is a top view of a lower die showing main portions according to the present disclosure.

FIG. 3 is a schematic perspective view of main portions according to the present disclosure.

FIG. 4 is a cross-sectional view taken along a line A-A of FIG. 1.

FIG. 4A shows a state before a workpiece is fixed.

FIG. 4B shows a workpiece in a fixed state.

FIG. 5 is a partial schematic view seen from a part C of FIG. 2.

FIG. 5A shows an upper die in a raised state.

FIG. 5B shows a state where the upper die is lowered.

FIG. 6 is a flow chart of a forging method according to the present disclosure.

BEST MODE

Hereinafter, a preferred embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. However, It should be understood that the present disclosure may be implemented in a number of different forms and the present disclosure is not limited to embodiments as described.

FIG. 1 is a schematic perspective view showing a forging apparatus according to the present disclosure. FIG. 2 is a top view of a lower die showing main portions according to the present disclosure. FIG. 3 is a schematic perspective view of main portions according to the present disclosure. FIG. 4 is a cross-sectional view taken along a line A-A of FIG. 1. FIG. 4A shows a state before a workpiece is fixed. FIG. 4B shows a workpiece in a fixed state. FIG. 5 is a partial schematic view seen from a part C of FIG. 2. FIG. 5A shows an upper die in a raised state. FIG. 5B shows a state where the upper die is lowered. FIG. 6 is a flow chart of a forging method according to the present disclosure.

As illustrated in the drawings, an apparatus for forging a workpiece according to the present disclosure includes a press 1 having upper and lower dies 11 and 12, and includes a tray plate supply assembly 2 that supplies, by one pitch, a tray plate 7 in a raised or lowered manner from one side (hereinafter, a left side of the drawings will be referred to as one side and a right side of the drawings that is an opposite side thereto will be referred to an opposite side) to the opposite side towards a middle portion of a top of the lower die 12 and to be spaced from a top face of the lower die 12.

The forging apparatus according to the present disclosure includes a punching unit 3 disposed on the upper and lower dies 11 and 12 at one side thereof to continuously form a workpiece fixing hole 71 in the tray plate 7; a workpiece plate supply assembly 4 provided in front of an opposite side of the punching unit 3 for feeding a workpiece plate 8 at one pitch to a position below the workpiece fixing hole 71 defined in the tray plate 7, wherein the workpiece plate supply assembly 4 forms a through-protrusion 82 to pass through the workpiece fixing hole 71 at a top of a middle portion of a portion of the workpiece plate 8 corresponding to the fed one pitch; a cutting and pressing and fixing assembly 5 provided on the upper and lower die 11 and 12 at the opposite side of the punching unit 3 for cutting the workpiece plate 8 to be fed to the position below the workpiece fixing hole 71 of the tray plate 7 by one pitch and for pressing and fixing the through-protrusion 82 formed on the rear end of the cut workpiece 81 into the workpiece fixing hole 71; and a pressing and shaping unit 6 disposed on the upper and lower dies 11 and 12 at the opposite side of the cutting and pressing and fixing assembly 5 for compressing and shaping the moved workpiece 81.

Further, the press 1 has the upper and lower dies 11 and 12. The upper die 11 is raised and lowered from and toward a top of the lower die 12. A configuration in which the upper die 11 is moved upward and downward is already known, and a detailed description thereof will be omitted.

Further, the tray plate supply assembly 2 constituting the apparatus of the present disclosure is spaced from one side of the press 1 to supply the tray plate 7 wound on a roller to the top face of the lower die 12 of the press 1. The tray plate supply assembly 2 feeds the tray plate 7 from one side to the opposite side by one pitch to the top face of the lower die 12 via driving of upper and lower rollers associated with each other.

The tray plate supply assembly 2 further includes an ascending and descending guide 13 for supplying the tray plate 7 away from the top face of the lower die 12 and allowing the tray plate to move up and down.

The ascending and descending guide 13 includes a plurality of ascending and descending guide rods 131. The plurality of ascending and descending guide rods 131 are formed on a middle region of a top of the lower die 12 and arranged at intervals in a right-left direction. The plurality of ascending and descending guide rods 131 are maintained in an ascended position via an underlying spring S while ascending and descending. The plurality of ascending and descending guide rods 131 are in close contact with a bottom face of the tray plate 7. That is, when the upper die 11 is lowered, the tray plate 7 is moved downward and is brought into close contact with the top face of the lower die 12.

Thus, the apparatus according to the present disclosure feeds the tray plate 7 to be spaced apart from the top face of the lower die 12 via the ascending and descending guide 13 including the ascending and descending guide rods 131. As a result, when the compression by the cutting and pressing and fixing assembly 5 causes the through-protrusion 82 formed in the middle portion of the workpiece 81 to pass through the workpiece fixing hole 71 defined in the tray plate 7, the through-protrusion 82 can be smoothly inserted into the workpiece fixing hole 71.

In one example, the tray plate 7 includes an upward-bent reinforcement plate 72 formed in a length-direction at the front and rear end of the tray plate 7 for reinforcing the tray plate 7. The upward-bent reinforcement plate 72 prevents the tray plate 7 from being twisted or warped.

Further, the punching unit 3 constituting the apparatus according to the present disclosure is disposed on the upper and lower dies 11 and 12 at one side thereof. The punching unit 3 serves to continuously form a workpiece fixing hole 71 in the tray plate 7. Further, the workpiece fixing hole 71 includes a plurality of fixing holes 711 for firmly fixing the workpiece 81.

In addition, the punching unit 3 includes a plurality of punchers (not shown) protruding downward from the upper die 11, and a plurality of discharge holes (not shown) defined in the lower die 12 for receiving a piece punched by with the puncher.

Further, the workpiece plate supply assembly 4 constituting the apparatus of the present disclosure is spaced from the front of the press 1. The workpiece plate supply assembly 4 serves to supply the workpiece plate 8 wound on a roller to the cutting and pressing and fixing assembly 5. In addition, the workpiece plate supply assembly 4 is disposed in front of the cutting and pressing and fixing assembly 5. The workpiece plate supply assembly 4 may include a workpiece plate supply unit 41 for supplying the workpiece plate 8 at a pitch and protrusion forging means 42 disposed between the workpiece plate supply unit 41 and the cutting and pressing and fixing assembly 5 for shaping the through-protrusion 82.

The workpiece plate supply unit 41 feeds the workpiece plate 8 at one pitch above a through-fixing portion for the workpiece 81 via the driving of upper and lower rollers interlocked with each other. The workpiece plate supply unit 41 is already known, and a detailed description thereof will be omitted.

The protrusion forging means 42 may shape the through-protrusion 82 on the workpiece plate 8 by compressing the workpiece plate 8. To this end, the protrusion forging means 42 may include a fixed lower die 421 and an ascending and descending upper die 422. The fixed lower die 421 has, at a top, a protrusion-shaping convex portion 421 a. The ascending and descending upper die 422 is disposed above the fixed lower die 421, and has a protrusion-shaping concave portion 422 a at a bottom thereof. The ascending and descending upper die 422 may shape the through-protrusions 82 in a repetitive compression manner via iterative ascending and descending. Further, the through-protrusion 82 includes a plurality of through fixing pins 821, wherein the plurality of through fixing pins 821 penetrates the fixing holes 711 constituting the workpiece fixing hole 71 and then a top of the plurality of through fixing pins 821 is compressed and extended by the cutting and pressing and fixing assembly 5.

Further, the cutting and pressing and fixing assembly 5 constituting the apparatus according to the present disclosure is constructed to repeatedly cut the workpiece plate 8 inserted into the cutting and pressing and fixing assembly 5, and to press and fix the rear end of the cut workpiece 81 end to the tray plate 7.

To this end, the cutting and pressing and fixing assembly 5 includes a workpiece cutting unit 51 provided with a workpiece cutter 511 at a lower front of the upper die 11 to cut the workpiece plate 8 via a lowering of the upper die 11, and a workpiece pressing and fixing unit 52 provided at a rear end of the workpiece cutting unit 51, wherein the workpiece pressing and fixing unit 52 has a compressing pin 521 at a bottom of the upper die 11, wherein the workpiece pressing and fixing unit 52 pushes the through-protrusion 82 formed in the rear end of the workpiece 81 into the workpiece fixing hole 71 and compresses and fixes a top of the through-protrusion 82 into the workpiece fixing hole 71 via the lowering of the upper die 11. That is, when the compressing pin 521 is lowered to compress the top of the through-protrusion 82, the top of the through-protrusion 82 extends like a rivet, such that the through-protrusion 82 is permanently inserted and fixed within the workpiece fixing hole 71.

The cutting and pressing and fixing assembly 5 further includes a guide plate 53. The guide plate 53 has a rear end fixed to the lower die 12. The guide plate 53 protrudes forwards to be spaced from the top face of the lower die 12. The guide plate 53 has a guide groove 531 defined in a lower portion thereof, into which the tray plate 7 is inserted to move to the opposite side. The guide plate 53 has a through hole 532 defined above the groove 531, through which the compressing pin 521 penetrates. In addition, the cutting and pressing and fixing assembly 5 further includes a plurality of ascending and descending guide rods 54. The plurality of ascending and descending guide rods 54 are disposed in the top portion of the lower die 12 and are arranged in a front-rear direction. The plurality of ascending and descending guide rods 54 are maintained at their elevated position via the underlying spring S while ascending and descending. The plurality of ascending and descending guide rods 54 are in close contact with the bottom face of the workpiece plate 8 supplied from the front.

In addition, the workpiece 81 may be made of metal. The tray plate 7 may be preferably made of a metal having a lower ductility than the workpiece 81. Further, the workpiece 81 may be made of aluminum or copper. The tray plate 7 may be made of iron or stainless steel.

Thus, according to the present disclosure, while only the middle portion of the workpiece 81 is fixed to the tray plate 7, the workpiece 81 is press-shaped at the rear and front portions thereof. Thus, a chip or burr generated by drilling the workpiece fixing hole 71 in the tray plate 7 does not affect the shaped rear and front portions of the workpiece 81 at all. Therefore, according to the present disclosure, in the compression-shaping of the workpiece 81, this may prevent the shaping failure due to the influence of chips or burrs generated during the boring of the tray plate 7, thereby to achieve an advantage of minimizing a defective shaping rate.

Further, the pressing and shaping unit 6 constituting the apparatus according to the present disclosure is provided on the upper and lower dies 11 and 12 to compress-shape the moved workpiece 81.

To this end, the pressing and shaping unit includes at least one workpiece shaping unit 61 provided at one side of the press for shaping the front and rear portions of the workpiece 81 via compression; and a last shaping unit 62 provided on the upper and lower dies 11 and 12 at the opposite side of a single workpiece shaping unit 61 and of a workpiece shaping unit 61 located at the most opposite side among the plurality of workpiece shaping units 61, wherein the last shaping unit 62 compresses and cuts, via a vertical cutter C, the shaped front and rear portions of the workpiece 81, which has been shaped via the one or more workpiece shaping units 61, thereby obtaining a final product.

Hereinafter, the forging method according to the present disclosure will be described.

As shown in FIGS. 1 to 6, the forging method according to the present disclosure may be performed using the forging apparatus described above, or may be performed using another forging apparatus. In describing the forging method according to the present disclosure, an example using the forging apparatus according to the present disclosure as described above is considered.

Accordingly, the forging method according to the present disclosure first performs an operation 100 of ascending and descending the upper die 11 of press 1 repeatedly, wherein the press 1 includes the upper and lower dies 11 and 12, which sequentially have the punching unit 3, the cutting and pressing and fixing assembly 5, and the pressing and shaping unit 6 from one side of the press 1 to the opposite side of the press 1.

Next, the method performs a workpiece fixing hole shaping operation 200 in which each time the upper die 11 is raised, the tray plate 7 is supplied by one pitch toward a middle portion of a top of the lower die 12 so as to be spaced apart from a top face of the lower die 12 in such a manner that the tray plate 7 can ascend and descend, and at the same time, the workpiece fixing hole 71 is continuously punctured in the tray plate 7 via the punching unit 3.

Next, the method performs a workpiece plate supply operation 300 in which each time the upper die 11 is raised, the workpiece plate 8 is supplied from a front by one pitch to a position below the workpiece fixing hole 71 of the tray plate 7 located on the cutting and pressing and fixing assembly 5, and, at the same time, the through-protrusion 82 to pass through the workpiece fixing hole 71 is formed on a top of a middle portion of a portion of the workpiece plate 8 corresponding to the supplied one pitch.

In this connection, the workpiece 81 may be made of metal. The tray plate 7 may be preferably made of a metal having a lower ductility than the workpiece 81. Further, the workpiece 81 may be made of aluminum or copper. The tray plate 7 may be made of iron or stainless steel.

Next, the method performs a workpiece fixing operation 400 in which the workpiece plate 8 supplied into the position below the workpiece fixing hole 71 located on the cutting and pressing and fixing assembly 5 is cut by one pitch, and, then, the through-protrusion 82 formed on the middle portion of the cut workpiece 81 passes through the workpiece fixing hole 71 and is compressed and fixed into the workpiece fixing hole 71. That is, the workpiece fixing operation 400 is repeatedly performed in a process of repeatedly ascending and descending the upper die of the press including the upper and lower dies. The operation 400 is preferably repeatedly performed in a process of supplying the workpiece plate by one pitch.

Next, the method performs a workpiece shaping operation 500 in which the workpiece 81, which is moved while being fixed to the tray plate 7, is compression-shaped by the pressing and shaping unit 6. Thereby, the compression-shaping of the workpieces 81 is completed.

Particularly, in the workpiece shaping operation 500, in order to compress-shape the workpiece 81 in various shapes, the workpiece 81 is shaped at the front and rear portions thereof via one or more workpiece shaping units 61, and then, the front and rear portions of the workpiece 81, which has been shaped via the one or more workpiece shaping units 61, is compression-cut by the vertical cutter C of the last shaping unit 62. This completes the last product.

Therefore, according to the forging method and forging apparatus according to the present disclosure, at the front and rear portions of the workpiece 81, two products can be simultaneously shaped, thereby to improve a productivity of compression-shaping.

Further, according to the forging method and forging apparatus according to the present disclosure, only the middle portion of the workpiece 81 is fixed to the tray plate 7 which fixes the workpiece 81. As a result, the front-rear directional width of the tray plate 7 is reduced. This can reduce the amount of the tray plate 7 used when shaping the workpiece 81, thereby lowering the manufacturing cost of the product. The forging apparatus according to the present disclosure fixes the workpiece 81 having the minimum size required for the last product to the tray plate 7 and then compress-shapes the product. Thus, the use amount of the workpiece 81 can be minimized, and thus, the manufacturing cost of the product can be reduced.

Further, according to the forging method and forging apparatus according to the present disclosure, the workpieces 81 are fixed to the tray plate 7 such that the workpieces 81 are arranged to be spaced apart from each other in a left-right direction. Thus, although the workpiece 81 is expanded in the lateral direction during the compression-shaping of each workpiece 81, the expansion may not impose any interference to neighboring workpieces 81. As a result, working accuracy can be improved during the compression-shaping of each workpiece 81, thereby shaping a high-precision product.

While the preferred embodiments of the present disclosure have been described, the present disclosure can employ various changes, modifications, and equivalents. It is clear that the present disclosure can equally be applied via modifications of the embodiments described above. Therefore, the above description does not limit the scope of the present disclosure as defined by the limitations of the following claims.

Although the detailed description of the present disclosure has been provided with reference to the specific embodiments, it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present disclosure.

REFERENCE NUMERALS

1: press

11: upper die

12: lower die

13: ascending and descending guide

131: ascending and descending guide rod

2: tray plate supply assembly

3: punching unit

4: workpiece plate supply assembly

41: workpiece plate supply unit

42: protrusion forging means

421: fixing lower die, 421 a: shaping convex portion,

422: ascending and descending upper die, 422 a: shaping concave portion

5: cutting and pressing and fixing assembly

51: workpiece cutting unit

511: workpiece cutter

52: workpiece pressing and fixing unit

521: compressing pin

53: guide plate

531: guide groove, 532: through-hole

54: ascending and descending guide rod

6: press-shaping unit

61: workpiece shaping unit

62: last shaping unit

7: tray plate

71: workpiece fixing hole

711: fixing holes

72: reinforcement plate

8: workpiece plate

81: workpiece

82: through-protrusion

821: through fixing pin 

1. A forging method comprising: an operation 100 of ascending and descending an upper die of a press repeatedly, wherein the press includes the upper and lower dies sequentially having a punching unit, a cutting and pressing and fixing assembly, and a pressing and shaping unit from one side of the press to an opposite side of the press; a workpiece fixing hole shaping operation 200 in which each time the upper die is raised, a tray plate is supplied by one pitch along a middle portion between front and rear portions of a top of the lower die from one side of the press to an opposite side of the press in such a manner that the tray plate can ascend and descend, and at the same time, a workpiece fixing hole is continuously punctured in the tray plate via the punching unit; a workpiece plate supply operation 300 in which each time the upper die is raised, a workpiece plate is supplied from a front by one pitch to a position below the workpiece fixing hole of the tray plate located on the cutting and pressing and fixing assembly, and, at the same time, a through-protrusion to pass through the workpiece fixing hole is formed on a front-rear directional middle portion in a portion of the workpiece plate corresponding to the supplied one pitch; a workpiece fixing operation 400 in which the workpiece plate supplied into the position below the workpiece fixing hole located on the cutting and pressing and fixing assembly is cut by one pitch, and, then, the through-protrusion formed on the middle portion of the cut workpiece passes through the workpiece fixing hole and is compressed and fixed into the workpiece fixing hole; and a workpiece shaping operation 500 in which the workpiece moved while being fixed to the tray plate is compression-shaped by the pressing and shaping unit.
 2. The forging method of claim 1, wherein in the workpiece shaping operation, the workpiece is shaped at front and rear portion of the workpiece via one or more workpiece shaping units, and then, the front and rear portions of the workpiece shaped via the one or more workpiece shaping units are compression-cut to complete a last product.
 3. A forging apparatus comprising: a press 1 having upper and lower dies 11 and 12; a tray plate supply assembly 2 configured to supply, by one pitch, a tray plate 7 from one side of the press 1 to an opposite side of the press 1 along a middle portion between front and rear portions of a top of the lower die 12 such that the tray plate 7 can ascend and descend each time the upper die 11 is raised; a punching unit 3 disposed on the upper and lower dies 11 and 12 at one side thereof to continuously form a workpiece fixing hole 71 in the tray plate 7; a workpiece plate supply assembly 4 disposed in front of an opposite side of the punching unit 3 for feeding a workpiece plate 8 by one pitch to a position below the workpiece fixing hole 71 defined in the tray plate 7, wherein the workpiece plate supply assembly 4 forms a through-protrusion 82 to pass through the workpiece fixing hole 71 on a front-rear directional middle portion in a portion of the workpiece plate 8 corresponding to the fed one pitch; a cutting and pressing and fixing assembly 5 provided on the upper and lower dies 11 and 12 at an opposite side of the punching unit 3 for cutting the workpiece plate 8 to be fed to the position below the workpiece fixing hole 71 of the tray plate 7 by one pitch and for pressing and fixing the through-protrusion 82 formed on the middle portion of the cut workpiece 81 into the workpiece fixing hole 71; and a pressing and shaping unit 6 disposed on the upper and lower dies 11 and 12 at an opposite side of the cutting and pressing and fixing assembly 5 for compressing and shaping the fed workpiece
 81. 4. The forging apparatus of claim 3, wherein the tray plate supply assembly 2 includes an ascending and descending guide 13 configured for supplying the tray plate 7 away from the top face of the lower die 12 and allowing the tray plate to move up and down.
 5. The forging apparatus of claim 4, wherein the ascending and descending guide 13 includes a plurality of ascending and descending guide rods 131, wherein the plurality of ascending and descending guide rods 131 are formed in a middle portion of a top of the lower die 12 and are arranged at intervals in a right-left direction, wherein the plurality of ascending and descending guide rods 131 are maintained in an ascended position via an underlying spring S while ascending and descending, wherein the plurality of ascending and descending guide rods 131 are in close contact with a bottom face of the tray plate
 7. 6. The forging apparatus of claim 3, wherein the workpiece fixing hole 71 includes a plurality of fixing holes 711, wherein the through-protrusion 82 includes a plurality of through fixing pins 821, wherein the plurality of through fixing pins 821 penetrates the fixing holes 711 constituting the workpiece fixing hole 71 and then a top of the plurality of through fixing pins 821 is compressed and extended by the cutting and pressing and fixing assembly
 5. 7. The forging apparatus of claim 3, wherein the workpiece plate supply assembly 4 includes: a workpiece plate supply unit 41 disposed in front of the press having the cutting and pressing and fixing assembly 5 for supplying the workpiece plate 8 by one pitch; and protrusion forging means 42 disposed between the workpiece plate supply unit 41 and the cutting and pressing and fixing assembly 5 for shaping the through-protrusion
 82. 8. The forging apparatus of claim 7, wherein the protrusion forging means 42 includes a fixed lower die 421 and an ascending and descending upper die 422, wherein the fixed lower die 421 has, at a top of the die 421, a protrusion-shaping convex portion 421 a; wherein the ascending and descending upper die 422 is disposed above the fixed lower die 421 and has a protrusion-shaping concave portion 422 a at a bottom of the die 422, wherein the ascending and descending upper die 422 repeatedly shapes the through-protrusions 82 in a repetitive compression manner via iterative ascending and descending.
 9. The forging apparatus of claim 3, wherein the cutting and pressing and fixing assembly 5 includes: a workpiece cutting unit 51 provided with a workpiece cutter 511 at a lower front of the upper die 11 to cut the workpiece plate 8 via a lowering of the upper die 11; and a workpiece pressing and fixing unit 52 provided at a rear end of the workpiece cutting unit 51, wherein the workpiece pressing and fixing unit 52 has a compressing pin 521 at a bottom of the upper die 11, wherein the workpiece pressing and fixing unit 52 pushes the through-protrusion 82 formed on the middle portion of the workpiece 81 into the workpiece fixing hole 71 and compresses and fixes a top of the through-protrusion 82 into the workpiece fixing hole 71 via the lowering of the upper die
 11. 10. The forging apparatus of claim 9, wherein the cutting and pressing and fixing assembly 5 further includes a guide plate 53, wherein the guide plate 53 has a rear end fixed to the lower die 12, wherein the guide plate 53 protrudes forwards to be spaced from the top face of the lower die 12, wherein the guide plate 53 has a guide groove 531 defined in a lower portion of the plate 53, into which the tray plate 7 is inserted to move to the opposite side, wherein the guide plate has a through hole 532 defined above the groove 531, through which the compressing pin 521 penetrates.
 11. The forging apparatus of claim 9, wherein the cutting and pressing and fixing assembly 5 further includes a plurality of ascending and descending guide rods 54, wherein the plurality of ascending and descending guide rods 54 are disposed in a top portion of the lower die 12 and are arranged in a front-rear direction, wherein the plurality of ascending and descending guide rods 54 are maintained at an elevated position via an underlying spring S while ascending and descending, wherein the plurality of ascending and descending guide rods 54 are in close contact with a bottom face of the workpiece plate 8 supplied from a front.
 12. The forging apparatus of claim 3, wherein the pressing and shaping unit 6 includes: at least one workpiece shaping unit 61 provided on the upper and lower dies 11 and 12 for shaping the workpiece 81 via compression; and a last shaping unit 62 provided on the upper and lower dies 11 and 12 for compress-cutting, via a vertical cutter, the front and rear portions of the workpiece 81 shaped via the one or more workpiece shaping units 61, thereby obtaining a final product.
 13. The forging apparatus of claim 3, wherein the tray plate 7 further includes an upward-bent reinforcement plate 72 formed in a length-direction at front and rear ends of the tray plate 7 for reinforcing the tray plate
 7. 14. The forging apparatus of claim 3, wherein the workpiece 81 is made of metal, wherein the tray plate 7 is made of a metal having a lower ductility than the workpiece
 81. 15. The forging apparatus of claim 14, wherein the workpiece 81 is made of aluminum or copper, wherein the tray plate 7 is made of iron or stainless steel. 